The basic requirement of broiler chickens for Vitamin E is 10-15 mg/kg. The need for extra supplementation will depend on the level and type of fat in the diet, the level of selenium, and the presence or absence of pro- and anti-oxidants. Thermal processing of feeds can result in the destruction of up to 20% of Vitamin E. Enhancement of immune response and improvements in the shelf-life of broiler meat are observed at Vitamin E levels up to 300 mg/kg. The levels suggested in the nutrition tables within the published Broiler Nutrition Specifications are suitable for the production of healthy broilers under normal conditions, but there may be situations (e.g. disease outbreaks) where higher levels of Vitamin E are justified.